Reinforcing means for concrete.



}. F. HVEIVIEYER.

REINEOHCING MEANS FOR CONCRETE APPLICATION FILED 1750.15.1909.

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JOHN F. HAVEMEYER, OF ARDSLEY-ON-HUDSON, NEW YORK.

REINFORCING MEANS FOR CONCRTE.

Application filed December 15, 1909. Serial-No. 533,173.

Be it known that I. JoiiN F. HAVEMEYER, a citizen of the United States, and a resident of Ardsley on Hudson, in the county of .lVestchester and State of New York, have invented an Improvement in Reinforcing Means for Concrete. of which the following description, in connection with the accompanying drawings, is a specification, like letters and numerals on the drawings representing like parts.

This invention i'elates to reinforcing means intended to be embedded in concrete or the like to contribute to the strength of the composite structure.

Among other objects, the invention is designed to provide a reinfprcing bar, suitably deformed to afford effective bonds to engage the concrete, which shall be economical in manufacture and have uniform crosssectional area throughout such part of its 4length as may be desired.

It has been attempted heretofore. to use reinforcing bars having projecting bonds, of which adjacent projections on the saine or contiguous surfaces of the bar merged into one another. more or less. Such a construction presented serioiis disadvantages, familiar to those skilled in the art; for instance, intersecting bonds are ditiicult to roll accurately, since the roll at the point of intersection of the individual bond grooves is likely to distort improperly the` material of the reinforcing bar, so that the `juncture of-` the intersecting bonds presents either a surplus of material which 1s wasted,

i aggregating a substantial value in the great quantity of material used in these bars, or else a lack of sufficient material to form the intersectingportions of the bonds, such lack leaving a weakness in the bar by reason of the diminished cross section at the point where the fault occurs. The present invention obviates all ditliculties arising from such causes as have been suggested.

Another difiiculty heretofore experienced in many types of bars has been caused by the fact that adjacent portions of mating rolls, which cooperate to form between them a deformed bar, have been required to shape A or form projections or depressions on the bar by the conjoint action of said adjacent surfaces. It is a matter of common expe- .rience in rolling mills that the opposed cooperating rolls become offset in relation one 'to another, in' such manner that forming- Specication of Letters Patent.

Patented aug. 3i, 1915.

grooves or the like on their contiguous faces will not register, and therefore will faill utterly to act conjointly with any accuracy.

It is one of the objects of this invention to provide a bar of such construction that it can be rolled as conveniently and accurately as otherwise, with offset rolls.

The character of the invention may be best understood byereference to the accom- -panying drawings. in which, l Figure 1 is a cornerwise View of a bar.

which is substantially square in cross section; Fig. 2, a section on the line 2 2 of Fig. l; Fig. 3, a section on the line 3 3 of Fig. l; Fig. 4, a side view of a bar embody. ing the invention. which is substantially circular in cross section: Fig. 5 is a top View of the bar ot Fig. 4; and Figs. 6 and 7.are

sections respectively on the lines 6 6 and 7 7 of Figs. 4 and 5. K

Referring to Figs. l, 2 and 3, the bar there shown has preferably each of its faces provided with a plurality of projections 7 8, substantially isolated from each other in sov that each projection is formed upon, and entirely surrounded by, the .surface of the bar, adjacent'projections being separated by portions of the surface of the bar. lVith such an arrangement each projection is formed independently of the others by an isolated groove on the roll, and there being no intersection of such grooves, the ditiiculties pointed out above in respect to a roll of that character are entirely obviated. p

Preferably each face of the bar has a plus rality of projections 7 7, disposed obliquely to the length of the bar and parallel to each other; and also af plurality of projections 8 8 oblique to the length of the bar and parallel to each other, but staggered in relation to the projections '7 7. Preferably, also, the groups of projections 7 7 and' projections 8 8 extend transversely to eachy aries of a face of the bar; that is to say,

m Linnea? '.with particular reference` to the polyhedral 4har of Figs. 1, 2 and 3, '1i/ne of the projections extends beyond a corner the bar.

ln other Words, one of the rolls for orining such a bar have suitable grooves lor the projections on one face, and those of an ad jacent face may be formed by another roll independently of the first, there being no deiorxning oi' the bar by the conjoint operation of contiguous parts of the rolls. Thus the described construction oi' the bar perniits the latter to be rolled in the manner illust ated by the dotted lines in Fig. 2, as accurately by odset rolls us by rolls which register with perfect accuracy.

ln the illustrative construction of l, 2, and 3 each projection contrilnites in seine degree to the cross-sectional area of the bar. rllhe projections, preferably in the inform of ribs 7-7 and 8-8, areA of equal and uniform cross-sectional areas throughout the greater parts of their lengths. At certain lparts. of the bar, however, as on the vsection of l, the cross section o't the bar comprises part of the cross section et 'nach of the projections and 8, as shown in Fig. ln order to preserve uniformity of cross-sectional area at those points where such includes parts of tivo or more projections, ythe letter are appropriately f pere/ol as indicated at 9, l0. By an appro 7printe proportioning of the roll grooves, these tapers may be accurately so inade that in any cross-sectional plane, the aggregate of the intercepted areas on the two tapers will ,equal the4 normal uniform cross-sectional area ofthe projections proper. By this arrangement it'fis provided, in the convstruction of l, that ythe projections throughout the. length of the bar contribute uniformly to the cross-sectional area oi the bar as a Whole, `whether that cross-section be in a plane intersecting only a single projo@ tion on a face, or parts of two 'projections on a face. To express it dilerently, the volinne of material projecting :troni alace in the Fig. l 4construction has uniform crosssectional area vthroughout the length oi the bar and this entirely independently of any other face or faces. rlhis feature of construct-ion permits the respective faces to be rolled, each independently of the others, and contributes to render it entirely immaterial that opposed rolls may be substantially oli'-,

setandout of register.

Figs, 4, 5, 6 4and 7 show the general construction and arrangement of Figs. 1, 2 and 3, as applied to a round bar. Assuming an axial plane in Fig. 7, projections 12- l2 and l3-l3, prete-ably individually iso 60 lated, are disposed in the staggered groups already referred to, entirely on one side of the axial plane and corresponding groups may be disposed on the surfaces of the bar at the other side of said axial plane. rlhis leaves an area throughout the length of the bar Where the surface isintersected by said' axial plane which may be entirely undisturbedl in the rolling operation; that is to say, alonO' tivo diainetrically disposed 70 areas extendi lengthwise the bar, no del orination tal is place. This construction, es alreaiily ezltplained, lends itsch excellently 4to the rolling by opposed rolls, contiguousl parts oi which have only to preserve the un- 'Z5 disturbed surfaces pro-:riunite the intersection of the axial plane sus.

Each ot' the projections l2, l2 and 13, 13 has its ends appropriately' tapered for the purposes already l'ully explaii'ied. 80

it will he evident to those skilled in the art that embodiments of the invention hereinheliore described. for illustration possess many advantages not particularly pointed out.

Obviously, also, the invention is not liniited to the precise constructions and organizations described; on the contrary, the invention may he variously en'ihodied withih the scope oi' the suhjoined claiin. 90

Claim l A reinforcing bar having along its length and on one side of an axial plane thereof a pluralhy of separate groups of obliqucly positioned projections, relatively staggered, each projection ol one group transversely overlaoping a projection oi a. group in staggered rclation thereto and each projection being individually isolated by the normal surface oi' the har, the overlapping and over- 100 lapped portions ol" the projections being shaoed and relatively proportioned to preserve 'uniform cross-sectional area of projecting nniterial on eachside of the aforesaid axial plane. i 105 ln testimony whereof, l have signed my naine to this specification, in the presence of tivo subscribing witnesses.

JOHN l?, HiU/'EMEYER llt/fitnesses lW. ll. Ponen, Rinnon C, RAFnLsoN. 

